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Finding the Fourth Proportional to 1,639.38, 2,459.85 and 817.72

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Solution

The fourth proportional to 1,639.38, 2,459.85 and 817.72 is: 1,226.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.38 : 2,459.85 = 817.72 : x
  2. Step 2: Convert to fraction form
    1,639.38/2,459.85 = 817.72/x
  3. Step 3: Cross multiply
    1,639.38x = 2,459.85 × 817.72
  4. Step 4: Simplify right side
    1,639.38x = 2,011,468.54
  5. Step 5: Solve for x
    x = 2,011,468.54/1,639.38
  6. Step 6: Final answer
    x = 1,226.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.